- Slides: 10
Biochar solutions for reducing pollution in the Netherlands Guido van Hofwegen, Joep A. van den Broek, Gertjan A. Becx, Ellis Hoffland, Oenema
Overview of this presentation Two Projects: n Assessment of the use of bio char as manure improver to reduce nitrogen pollution n Exploring the possibilities of charring green wastes in NL
Charcoal as manure improver - Intro Relevance: n n n Fast intensification of animal and arable sectors 2005: 11, 5 mln pigs, 100 mln chicken, 1, 5 mln dairy cows EU Nitrate Directive and Water Framework Directive
Charcoal as manure improver Research question: n Can charcoal improve the nutrient retention of Dutch sandy soils prone to leaching which are heavily fertilized with pig manure?
What can we expect? n Charcoal is reported to reduce N leaching by l l n Physical and chemical binding of N (in several ways) Stabilizing SOM (hypothesizing) But: l l l Nitrate concentrations increases(? ) What will happen with P? (Dutch sandy soils are Psaturated, increased availability might lead to leaching) Increased bacterial activity might increase gaseous losses (N 2 O).
Methods & Planning Pot experiments with several sand, charcoal and manure mixtures, representing the Dutch situation n Experiments will start in September n
Upcoming issues n n Which charcoal to use? How should we treat it before use (milling / NHO 3 treatment)?
Exploring possibilities of charring biomaterials in the Netherlands Exploratory study: n Exploring the possibilities of charring green wastes and other biomaterial for a) generating energy b) reducing the emissions of greenhouse gasses other than CO 2
Expected results Household and other organic waste (1 Mt C) 0. 5 C in 0. 1 compost biochar + NOW 0. 5 tons 7. 1 CO C 022 equivalent `Char scenario’ NOW
Issues to be addressed n n n Will it be cost effective? Is it possible to char ‘wet’ wastes? Will the charcoal be usable (heavy metal content / P content etcetera)?